Manufacture of sulfuric acid.



H. PETERSEN. MANUFACTURE OF SUEFURIO ACID.

APPLICATION FILED JAN. 2, 1907.

1mm I l'llIGO PETERSEN, til" \YIIMERSDUHF. NI'IA it Bl'lltlilN, GERMANY.

I.-:.NUFACTURE OF SULFURIC ACID.

To all whom it may con rem:

Be it known that l, l-litoo ln'rnnsrx. a chemical engineer. and a subject of the (lorinan Emperor, and a resident of 181 Kaiserallee. in the city of iunersdor'f, near Ber- Spec-mention of Lettem Patent.

Patented Nov. 17, 1908.

Application filed January 2, 1907. Serial No. 350.552.

avid ot' the said tower 7 should have gone down too far. the acid is exchanged for entirely lresh rinsing acid, that is to say for a fresh supply of cold nitrous vitriol of about d grees lie. g indicates the Gay-Lussaclin, Kingdom of Prussia, and (lei-man lilll- 1 pin-(have invented certain no and u eful improvements in the Illanufacture of Sulfuric Acid, of which the following is a specification.

This -l'n\'(-'I.|ll()11 has reference to improvemoms in the art of mainifacturing sulfuric arid by the lead'clnuuher method, and it intended iouroid the ditlicultit-s \x-hich are caused by the escape of unc onvcrtwl sulfurdioxid or of an excess of oxids of nitrogen from the last chamber. as it. occurs for in" stance in the so-ealled, system of fort-ed working of lead chambers, or in the case of a gr at increase or. the amount of nitric acid led to the lead-chamber system, and in lincast; it irregularly burning sultid-ores.

(in the accompanying sheet of drawing, a plant for carrying the invention into practic-e, i shown diagrammatically by way oi example in Figure 1 in plan View, and in l' ig in side View.

In the drawings--11 indicates the kiln for tower from the foot of which the nitrous vitriol which pos; ,s tos the ordinary strcngtl'i ol about (it) degrees llaume is passed to the top of tlug (ilovei' tower I). /1 and n are acid pumps or acid eggs, arranged in suitable places on the'ahove mentioned acid conduits.

I m is the conduit for carrying the strong dctower.

generating sult'ur-dioxid gases; 6 indicates the Gloria-lower which is rinsed in the usual manner, well-known in the art, with sulturlc acid containing dissolved OXldS oi nitrogen,

that is to say with the nitrous vitriol, pro- 1 duced at. the foot of the GayJiassac-tower and fed to the top of the said Glover tower by the conduit 0. The lead chambers into which the, gases pass from the Glover tower. are indicated at and (Z, while 6 is another chambers a, ill. The gases are then passed into what I may call a regulator which shown in the drawing. as being an acid tmver. This tower f is rinsed With cold ni trons vitriol of about titty-five degrees name. The acid which passes off at the foot oi thi lower, after it has come in cou- 1 tor tower 7' which has increased its stren h ta-(1i. with the. ium'iediatcly leaving the last l adcl'ianil'ier, is run into a tank or cisicro 1f. win-rice it is pu'rnpcd back again. thr all the condui' to the top of the said vitriol. so as to meizu-iii" the proper Pom-en- Strength oi nosing ilator tower f. so as to circulate over nitratcd a id from the bottom of the Glover tower to the to]: of the (lay-laissae-tower "for the purpose of rinsing said (lay-Lussac- The direction oi. the flow of the liquids is indicated by arrows in the drawing.

In case any unconverted sulfur-dioxid ,gzncs should escape from the lust lead cham her. they are immediately converted into acid by the cold nitrous vitriol of 3 136., of the regulator -t.owcr f, the sulfuric acid formed going to compei'isate the acid diluting influence oi the water vapors escaping from the last chamber and assing into the reg-ulater-tower likewise. The nitrogen-(mid gases, lila-rated in the rcgulator-tower by the said for) vtion of sul't'uri; acid are absorbed in the iellowing (lay-Llissao-tower or towers. By the formation of sulfuric acid. the rinsing acid of the regulator towcr f becomes better adapted for the absorption of an excess of nitrogenoxids. thereby increasing its own percentage in nitrogen-oxids. inasmuch, in those cases, where unconverted sulfur-dioxid gases escape from the last; lead-ohaniber, this diffiunity is usually corrected by increasingthe leadchamber of smaller izethan the lead 1 addition of nitric acid to the top of the creased quantity of nitrogenoxids is then absorbed by the rinsing acld of the regulain sulfuric acid in the previous stage. T us the treatment of the gases, escaping from the last chamber, with cold nitrous vitriol of about B. strength acts as a means of regulating the lead chamber process, and of I preventing both escape of unconverted suli'ur dioxid gases, as well as escape 0t und oxids of nitrogen from the system. vitriol o" about ti' riv degrees Baum strength possesses the propertj of absorbing nitrogen oxids very readily in the i cold, and of parting with the said OXldS ab sorbed just as readily, and without the neees- 4 Gay-Lussac treatment; substantially as and sity of an great dilution or of heating of the nitrous vitriol, as distinguished from the ordinary strong nitrous vitriol, used as an absorbent on the Gay-Lussac-towers.

VVhat- I claim and desire to secure by Leti ters Patent of the United States, is

The improvement in the-art of manufacturing sulfuric acid by the lead chamber method, said improvement consisting in bringing the in contact with cold nitrous vitriol of about fifty-five degrees Baum, immediately after the gases have left the lastlead'ehamber and prior to the for the purpose described. In testimony whereof I have affixed my:

signature to this specification in presence of two subscribing witnesses.

IIUGO PETERSEN. Witnesses:

HENRY HASPER, WoLnEMAn HAUPT. 

